[Xen-devel] xen trouble while guest excute float app

["ywzheng" <ywzheng@xxxxxxxxxxxxxxxx>]

I have a trouble with floating point number when I use xen. First I work on openSUSE 11.3, with xen-4.0.0_21091_05-6.6.x86_64. I create a windows XP domU, and make a simple program dealing with floating point number by Visual C++ 6. The program is:

void BUG()

{

  while(1);

}

func()

{

  float f = 1;

 

  while(1)

  {

    TRACE(“f = %f\n”, f);

    if(f < 0)

      BUG();

    Sleep(1000);

  }

}

 

When I use “xm migrate –live win1 hosta”, (hosta is the same computer), sometime print f = -1.#IND0, sometime goto BUG(). Why()?

 

Then I use xen-4.0.1-rc6, the same thing happen. Is this a BUG of xen?

My CPU is Intel Xeon L5408.When I use other CPU, for example Xeon L5420,I rarely meet the problem.

 

2010-09-06

---

ywzheng

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